Comment by omnicognate

A lot of people who find themselves having to deal with matrices when programming have never taken that class or learned those things (or did so such a long time ago that they've completely forgotten). I assume this is aimed at such people, and he's just reassuring them that he's not going to talk about the abstract aspects of linear algebra, which certainly exist.

I'd take issue with his "most programmers are visual thinkers", though. Maybe most graphics programmers are, but I doubt it's an overwhelming majority even there.